friedrich



M81111 B. FRIEDRICH 1,848,617

' PARALLEL VISE, CHUCK, AND SIMILAR CLAMPING DEVICE Filed May 12, 1930 3Sheets-Sheet 1 Fig.4

B. FRIEDRICH March 8, 1932.

PARALLEL vxss, CHUCK, AND SIMILAR CLAMPING nsvroa F iled May 12, 1930 5Sheet s-Shee t 2 Y B. FRIEDRICH March 8, 1932.

PARALLEL VISE, CHUCK, AND SIMILAR CLAMPING DEVICE Filed May 12, 1930 3Sheets-Sheet 3 Patented Mar. 8, 1932 PATENT OFFICE BRUNO FRIEDRICH, OFVIENNA, AUSTRIA 4 PARALLEL VISE, CHUCK, AND SIMILAR CLAMYING DEVICEApplication filed 12, 1930, Serial No. 451,664, and in Great Britain May16, 1929.

The improvements in parallel Vises, chucks and the like which constitutethe subject matter of the present invention have reference to meanstilt-able members, as commonly used,

in tools of this kind, for enabling the work when being clamped, to besimultaneously retracted or drawn downwards towards the bed of the vise,or the base of the chuck and 7 thereby pressed firmly against such bedor base, so that the work is not only rigidly clamped between thesurfaces of the jaws ,whilst being operated upon but is also constantlypressed against a surface situated at right angles to the said jaws andthus held immovably all the time. i

In parallel vises,-chucks and the like of the type referred to, noabrupt warning is given workmen when thepressure jaws have reached theircorrect end position in which the rotation of the spindle or the like,which moves the blocks of the vise towards the pressure jaws clampingthe work, should be stopped. For this reason in parallel Vises of thisknown type, overrunning of the correct end position, by the pressurebodies occurs der or angular recess of the pressure body. 40

On further rotation of the spindle, pressure is transferred from theblock to the pressure jaw in the said angle of the shoulder or angu larrecess, so that a considerably greater resistance will be felt at thescrew spindle whereby it is indicated to a workman that the terminalposition has been reached;

In the drawings are shown by way of example, a number of constructionalembodiments of the invention as applied to a parallel Vise of which, forthe sake of simplicity, only one of the two pressure jaws is shown,together with the block appertaining thereto.

Fig. 1 of these drawings shows a form of construction embodying arotatable member.

Fig. 2 shows another construction in which both rotatable and tiltablemembers are interposed between the pressure jaws and the sliding block.

Fig. 3 shows a construction with a tiltable member only.

Fig. 4 shows a cross section through the vise.

Figs. 5 to 7 illustrate in three difi'erent positions a somewhatmodified constructional form of the tiltable member shown in Fig. 3.

Fig. 8 shows yet a further modification of the tiltable member accordingto this invention. 1

. Fig. 9 shows a construction forming a sep v,said pressure jaw by beingforced thereigainst. In order that the pressure jaw a may exert adownwardly acting pull when this movement takes place, there 1s insertedbetween the two parts a and d (see Fig. 1) a roller-like device 6, thecylindrical surface of which is cut away to form an angle. This deviceI) is carried in a cylindrical recess 0 in the block (1 and the pressurejaw a is bevelled off, as at e, the bevel being turned towards theangular recess in the roller device and making corresponding angles withthe boundary surfaces f and g of the angular recess. I i

If the block d be pushed towards the pressure jaw a the lower edge ofthe bevelled oil portion a will first bear against the surface f of theroller device 6, so that this latter will be rotated in its bearing a inthe direction indicated by the arrow 1. The other surface g of theroller device consequently presses (in the direction of the arrow 2)against the upper edge a of the bevelled off portion e or against ashoulder 70 on the pressure jaw a adjoining said bevelled off portion,thereby forcing said pressure jaw downwards. Thus, after the jaw has.come into contact with the work, the two together are pulled down on tothere may also be inserted, as shown in Fig-' ure 2, between the block(1 and the pressure jaw a, a tilting member n of prismatic shape 1ncross section, one of the lateral surfaces of which, when the device isat rest, bears against. a shoulder 0 on the pressure jaw a, the oppositelateral. surface thereof bearing against a pro'ection p on the block d.

7 When the look at is pushed towards the pressure jaw a this tiltingmember is tilted on its two diametrically opposite edges which engagerespectively with the shoulder 0 of the pressure jaw and with theinterior angle of the projection p on the block and while the block ispushed up against thepressure jaw the latter is simultaneously forceddownwards and presses the clamped piece of work against the basesurface.

In the roller and tilting devices shown in Figs. 1 and 2 which act onthe pressure jaws a b the block d being pushed towards the sai jaws bymeans of a screw spindle or the like, no abrupt warning is given to theworkman when the rotation of the spindle or the like should be stopped,owing to the proper clamping action having commenced.

. Accordin to the constructional form shown in Fig. 3 only a tiltingdevice it is interposed between the block 03 and the pressure jaw a andthis deviceis mounted in the same way as in the constructional formshown in Fig. 2. The tilting device a is substantially rectangular inshape and is provided with a wedge-shaped nose 1' which projectslaterally towards the pressure jaw 11.. "PM rear face of the pressurejaw, facing the tilting device has an angular recess 9 so arranged inrela tion to the nose r of the tilting device, that when the latter hasalmost reached the limit of its edge-on position between the projection12 and shoulder o the wedge-nose r becomes seated in the angular recess9.

When the block (2 is pushed towards the pressure jaw a the first result,as in Figure 2, is the tilting of the tilting member 71. and theconsequent drawing downward of the pressure jaw while the screw spindleis being rotated. When the tilting member, the nose 7* of which liessomewhat lower than the top edge which engages the interior angle of theprojection 19 has nearly reached the limiting edge-on position, furtherrotation of the screw spindle causes said wedge-shaped nose r to seat onto the bottom face of the recess 9,

so that it tends to force the pressure jaw still further downwards. Theworkman turning the screw spindle will, therefore, suddenly feel a muchgreater resistance which will in dicate to him that the correct amountof clamping action and drawing down of the pressure jaw has beenreached. The wedgeshaped nose 7 serves at the same time to secure andlock the pressure jaw in place.

Figs. 5 to 7 show a somewhat modified constructional form of the tiltingmember shown in Fig. 3. The tilting member 12., formed from a bar ofprismatic cross section, lies, when in the position of rest shown inFig. 5, with one of its sides bearing on the shoulder 0 of the pressurejaw a, while its op site side bears a ainst a projection p on the lockd. This tilting device it is also provided with a stout projection, ornose 7* which extends laterally towards the pressure jaw a, while thislatter, in addition to bein provided with the shoulder 0, also has an aditional inclined shoulder a, on which the said nose 1' is adapted tobear, as soon as the tilting member has been tilted nearly to itslimiting position.

When the block (Z is moved towards the pressure jaw a or towards thework to be clamped, that is to say, moved from the position of restshown in Fig. 5, the prismatic bar a tilts about the two diametricallyopposed edges thereof which bear against the shoulder 0 of the pressurejaw and the innetangle of projection p on the block. A straight linepassin through these edges is indicated at 3-3 in ig. 5. The tiltingmove- -100 ment referred to causes the pressure jaw to be forceddownwards and on continued rotation of the screw spindle the bar n isfurther tilted, the nose r on the latter gradually passing over theshoulder 2 of the pressure jaw. 105 Fig. 6 shows the position of thetilting member, shortly before its nose 7' comes into contact with theshoulder 2. At this stage pressure is transferred from the block 03 tothe pressure jaws a along the direction indicated by the line 4-4.- inFig. 6. On further rotation of the screw spindle the nose 7 comes intocontact with the shoulder a of the pressure jaw a and tends to force thesaid jaw still further downwards.

Fig. 7 shows the terminal position of the tilting member in which theopposite edges connected by the line 5-5 engage in the inner angle ofthe projection 72 and in the shoulder 2 of the pressure jawrespectively. lVhen 120 this position is reached considerably greaterresistance will be felt at the screw spindle thus affording tangibleevidence that the terminal position has been arrived at and, thereforethe correct amount of clamping action 1% and retraction of the pressurejaw produced.

It can also be seen from Fig. 7 that "the nose r holds the pressure jawsecurely in position and locks it thus preventing the clamped work fromyielding or slipping. 13G

Finally Fi 8 shows a further constructional form 0 vise constructedaccording to this invention. a again denotes one of the pressure jawsand d is the corresponding sliding block of a parallel vise. Betweenthese two parts is mounted an angle piece a one limb of which, in theposition of rest, bears against the projection p on the block d theextremities of its limbs then lying opposite the edges h, a'of thebevelled off part e of the pressure jaw.

If the block ll be forced towards the pressure jaw a the lower edge itof the bevelled off part e presses first against the vertical limb ofthe angle piece it (in the direction of the arrow 2) causing the latterto rotate about that edge which is engaged in the angle of the proection p on the block. As the result of this the other limb of the anglepiece presses (in the direction indicated by the arrow 1) upon the upperedge i of the bevelled off part 6 of the pressure jaw and against thesurface of the shoulder is adjoining said edge. In this way the pressurejaw is forced downwards, so that after coming into contact with thework, it is drawn down lwith this latter on to the surface m of: the

ase.

To enable the sliding blocks to be attached to the bed of the vise, orto the base surface of the chuck or other clamping device the undersideof each block may be furnished with ribs, which engage under the guideportion of the bed, so as to prevent the block from being lifted by thereaction of the turning moment set up, when the pressure jaw is drawndown. Preferably, the block a or another block 3 connected thereto ismade in one with the ribs t as shown in Fig. 4 and separate guide bars11 are inserted between the block .9 and the upper side 3 of the bed a.In the block .9 screws uare arranged on both' sides of the screw spindlew, the shouldered down -ends of these screws engaging in grooves in theguide bars 16 and pressing the latter against the bed.

When"'applying the invention to any kind of chucking or clamping deviceswhich ordinarily have at least two or, it may be, more than two blocksand pressure aws, the latter are ali'provided with an arrangementaccording to one of the constructional forms herein described.

Fig. 9 shows in an elevation view a construction forming a separate unitadapted to be inserted in parallel Vises, chucks and the like of anyusual type. In the embodiment, shown in Fig. 9, two tilting members 1*,m are inserted between the outer pressure jaw a and an inner pressurejaw a which are connected by means of links A, A for preventing the jawsto expand when the device is at rest. The linksA, A are mounted with oneend on pin B, B inserted in the inner pres.-

' sure jaw al while the other end of the links are mounted on pins C, Criveted to cover plates I) provided at each side of the outer pressurejaw a and connected thereto by means of screws E, E The pivoting centersof each link are spaced with the same distance as the workingwedge-shaped noses of each tilting member.

One or more coiled springs F inserted between the two pressure jaws andbearing against suitable shoulders of the jaws serve to move upwards thejaws a into the normal position.

.It will be understood that the number of links and springs used in thedevice shown in Fig. 9 may be varied.

What I claim is-:

1. In a clamping device of the kind deating therewith so that-when block(d) is Y forced toward the pressure jaw (a) the rotatable member (12)will be rotated in its cylindrical seat by the action of the lower edgeof the bevelled portion (e) on the opposing surface (7) and willtherefore be compelled to force the jaw downwards by surface (9) actingonthe upper edge of the bevelled portion.

2. In a clamping device of the kind described, a pressure jaw providedwith a rear face having a shoulder and an angular recess (g), a block(cl) having a projection (p), a tiltable member mounted on the pressurejaw between said jaw and block, said memberbeing angularly formed andprovided with a nose (1") adapted to extend into the recess (q) of thejaw, the arrangement being such that when'the tiltable member is movednear to its limiting edge on position, the nose acts on the pressure jawat a point which is lower than the uppermost edge of the tiltable memberwhich edge is engaged in the interior angle of the projection (p) ofblock ((5), and whereby forward movement of the jaw imparts tiltingmovement to said tiltable member to thereby depress said jaw.

3. A parallel ise, chuck or similar arrangement, accor ing to claim 2,characterized-by the fact that the blocks (d), or parts (a) connectedthereto, are made in one piece with the ribs, and separate guide barsbeing inserted loosely between the blocks and the upper side of the bedand said bars being pressed against said bed by screws (u) sunk in theblocks (03) or parts (a).

4. A pressure vise, said vise having cooperating jaws, a bed beneathsaid jaws, a pivotally seated block between the jaws, said block formingmeans whereby when the jaws are forced to ether one of said jaws will beforced towards the bed plate, a shoulder car ried by one of said jaws,said shoulder being positioned whereby when the jaws are forced togetherit will cooperate with one of said jaws and limit the downward movementof the movable jaw towards the bed.

5. The combination with a parallel vise having cooperating jaws movabletowards and away from each other, of a pressure device, said pressuredevice comprising a rotatable cylindrical member, rotatably mounted inone of the jaws and extending beyond one face thereof, the side of saidrotatable cylindrical member beyond the face of the jaw being recessed,a. bevelled shoulder carried by the other jaw in the path of saidrecess, said bevelled shoulder cooperating with one side of thecylindrical member within the recess thereof when the jaws are forcedtogether for rotating the cylindrical member and causing the other sideof the cylindrical member to engage the upper side of the bevelledshoulder and force its jaw downwardly.

6. The combination with a pivoted pris- I matic block having oppositeshoulders in recesses of vise jaws movable towards each other fordisplacing one of said jaws laterally in relation to the other, of ashoulder carried by said prismatic block, said shoulder bein (7 in thepath of a stop carried by one of said ried by said tiltable member andcooperating with a portion of the displaceable jaw for limiting thedisplacement of the jaw.,

In testimony that I claim the foregoing as my-invention, I have signedmy name.

BRUNO FRIEDRICH.

